Ratchet die-stock.



E. M. FULLER.

RATQHET DIE STOCK, APPLICATION FILED JUNE'ZG, 1909.

Patented July 5, 1910.

ZBHEETB-SEEET 1.

INVENTOR Ermes% JflTFuZLer WITNESSES:

. BY. 1 A

6 mom m.

ms m'm'ms PETERS cm, wnsmucwu, n. c.

Patented July 5, 1910.

m r s. m m R m .4 W I awx m L m 3 W 5 t .N j m 3 Wk k 3 Q m .3 x

E. M. FULLER.

RATGHET DIE STOCK. APPLIOATIOII rmm mm: 2a, 1900.

' WITNESSES:

-ls NORRIS PETERS cc., WASHINGTON, c

ERNEST IVL FULLER, 0F GRAND RAPIDS, MICHIGAN.

RATCHET DIE-STOCK.

Specification of Letters Patent.

Application filed June 26, 1909.

Patented July 5, 1910.

Serial No. 504,543.

To all whom it may concern:

Be it known that I, ERNEST M. FULLER, residing at Grand Rapids, in thecounty of Kent and State of Michigan, have invented a new and ImprovedConstruction of Ratchet Die-Stock, of which the following is aspecification.

This invention relates to that type of tools or implements, known aspipe threading die stocks, used for holding and operating the cuttingdies for threading pipe sections, and my invention primarily has for itsobject to provide a tool or implement of the character stated, of a verysimple and economical construction, adapted to hold the regulation sizesof pipe dies now in general use, and that is capable of operating thedie so as to cut the threads under either direction of movement of theoperating handle.

My invention also has for its object to provide a tool of the characterstated, in which a new and improved arrangement of pawls is provided forcoacting with the ratchet head of the stock and a single springcont-rolled means for both pawls or dogs, other details of constructionand peculiar arrangement of parts, all of which will be hereinafterfully described, specifically pointed out in the appended claims, andillustrated in the accompanying drawings, in which:

Figure 1, is a plan view of my invention, the top plate being removed,showing the parts in position to cut a right hand thread. Fig. 2, is asimilar view with the parts positioned for cutting a left hand thread.Fig. 3, is a view of the handle connection. Fig. 4c, is a bottom planview of my device. Fig. 5, is a cross section on the line 55 on Fig. &in the direction of the arrow. Fig. 6, 1s a detail view showing theratchet dogs locked out of operative connection. Fig; 7 is a section onthe line 77 on Fig. 6, in the direction of arrow.

In carrying out my invention, I form the holder substantially as shownin Fig. 1, it comprising a body portion 1 whose peripheral edge isformed into a series of radially disposed ratchet notches 10 and whosecentral portion is projected beyond the ratchet portion in bothdirections, whereby to provide the annular seats 11 to fit into thecircular seats 2030 in the top and bottom plates 2 and 3 that arecorrespondingly shaped, see Fig. 5 and form, as it were, a part of theoperating handle or frame, their rear ends fitting upon and beingsecured to the flattened head 50 of the handle shank 5 by the screwbolts 6-6, the said shank 5 having a socket like extension 51 that isinternally threaded to receive the threaded end of the wooden handle orgrip member 52.

7-7 designate angle brackets pendent from the bottom plate, that sustainthe tubular pipe guide or holder 8 that forms the bearing for the toolwhen actuating it to cut the pipe threads and this holder is in linewith the pipe passages in the bottom and top plates and with the die 9,which latter is of any of the well-known types of cutters, it having theusual thread cutting members 90 as shown. This die is held in the headstock by having its corners seated in the recess a: formed in the headstock, that is, held between the top and bottom plates as stated, itbeing obvious that in assembling the parts the top and bottom plates canbe secured by bolt and nut clamp so they can be readily separated whenit is desired to change the die.

Cooperating with the rotary ratchet head stock is a pair of dogs orpawls, the peculiar arrangement of which and the means for holding themalternately in engagement with the said head stock forms an essentialfeature of my invention. Pivoted near the outer edges of the top andbottom plates on studs 12 and 12 are the ratchet dogs 13 and 14. The twodogs are relatively arranged so that one of said dogs can be readilyswung backward out of operative engagement with the ratchet head as theother dog is held to the operative position and for holding the saiddogs to their back or inoperative position a snap spring 15-15 ismounted on the top plate at the opposite edges for locking thedogs tothe said turned back position as best shown in Fig. 6, by reference towhich it will be also noticed a single spring device is used for bothdogs or pawls that comprises a stout coil spring 16 and chain members16*-16" secured to the opposite ends of the spring coil, one of which16"' connects with the front of ratchet engaging member 14 of one pawlor dog and the other 16 engages with the front member of the other pawl,such arrangement of parts providing for effecting a tensile strain onthe spring for holding the pawl member 14 in an operative position whenthe other dog is swung back and to likewise act on the said other dog'13 when the dog or pawl la is thrown back, thesnap. springs holding thesaid dogs firmly to their thrown back pos tions; 7

7 By arranging the several parts as shown and described, the implementcan be readlly adjusted for cutting right or left hand threads on thepipe ends by simply shifting the dogs or pawls to the positions desired.It will be understood that in practice suitable means is provided forholding the clamp plates and 3O that lap over the shouldered edges ofthe ratchet member or carriervl and the plates 2 and 3 as clearly shown"in Fig. '5, from which it will be seen.

thatthe plates 20 and'30 and the ratchet carrierare joined by crossbolts.

I claim is: a 1, A deviceof the character stated comprising aistockconsisting of an upper and a lower plate havingopposite circular open- 7Qings, a rotatable carrier 'havingperipheral ratchet teeth mountedinsaid openings beh tween saidi plates, means for holding said- V carrierandsaid plates in their relative positions, a pair of independentlyactuating pawls pivoted each atone end between said 5 plates and havingthe other end free torenneans for; locking'one iof said pawls] out ofgage said ratchet, a single spring connected with said pawls at a pointbetween the pivot and the free ratchet engaging end thereof,

ving thus described my invention, what 7 operative position and holdingthe spring under tension while the other pawl is in engagement with theratchet, and connections between said spring and said pawls consist--1ng of flexible members, each of said pawls bemg'movable on its pivotthrough a distance approximately equal to 180 and the locking positionof said pawls being approximately 180 from the ratchet engaging positionof said pawls, said flexible members being of a length to prevent saidspring bending about the pawlpivots when the pawls are in their inactiveposition.

2. In a device of the character stated, a supporting frame, a rotatablemember mounted therein and having a peripheral ratchet face, a pairofpawls each pivoted at one end to said frame having their free ends toengage said ratchet, a coil spring, chains connecting said coil springwith each of said pawls, and means for locking one of said pawls out ofengagement with said ratchet to hold said spring under tensionwhilevsaid other pawl is in engagement with said ratchet, each of saidpawls being movable on its pivot through a distance approximately 180and the locking position of said pawls being approximately 180 from theratchet engaging position of said pawls, said chains each being of alength to prevent said spring bending about the pawl pivots when thepawls are in their inactive position.

ERNEST M. FULLER.

Witnesses:

ART. WALsH,

THEODORE FINDL'EY;

